Subphylum Cephalochordata Protochordata


 
 
Concept Explanation
 

Subphylum Cephalochordata Protochordata

Subphylum Cephalochordata (Protochordata): Amphioxus (Branchiostoma) is the only living representative of this subphylum. They are transparent, fishlike creatures without a brain and eyes.

  • They spend most of their life buried in the sediments under the oceans.
  • They possess all the characteristics of chordates.
  • The notochord extends through the body up to the head.
  • The nerve cord lies above it.
  • They have gills and a tail, and their circulatory system lacks a heart. Excretion occurs through protonephridia.
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    Sample Questions
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    Question : 1

    Prtonephridia are the excretory organ of __________________ organism.

    Right Option : D
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    Explanation
    Question : 2

    Urochordata differ from the Cephalochordata in the fact that ___________ .

    Right Option : C
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    Explanation
    Question : 3

    Cephalochordates are included under the phylum Chordata because _________________________ .

    Right Option : C
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    Explanation
     
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